# Full text of "The Flow Of Gases In Furnaces"

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```DESIGN  OF OPEN-HEARTH FURNACES

279

Gas on Gas
Air on Air
Gas on Waste Gas
Air on Waste Air

Frictional resistance of fantails for air and gas: Q0 = volume of gases .........
5 m332
8 m3 51
5 m3 19
7 ms 58

Qt = QQ(l-}~oit) = .   .   .
15 m3 08
13 m3 19
20 m3 43
24 m3 27

i}t = Qt -r- a? = m per sec
5 m 03
2 m  51
6 m 81
4 m  62

A0 = specific weight gases .... At = Ao -r- ( 1 -\-ctt) = kg per m3. . £L^co =   .
1.125 0.397 10 00
1.293 0.834 11 43
1.32 0.335 10 00
1.32 0.412 11 43

y = frictional resistance IL. kg per m'- = 0.016X10.00X5.03X0.397 =
0 kg 320

0.016X11.43X2.51X0.834 =

0 kg 383

0 016X10 00X6 81X0 335 =

0 kg 338

0 016X11.43X4.62X0 412 =

0 kg 359

The pressure necessary to impress their velocity upon the flowing gases will be: 8 = A/?;/2 -r- Id] = ker ner m2 .....
0.512
0.268
0.795
0.454

Stack Flue to Boiler or Chimney
Stack Flue from Air Valve
Stack Flue from Gas Valve

Frictional resistance of flues: L = length in meters ................
5 m  00
4m  00
8 m  00

\$ s= perimeter in meters ..............
8 m  00
8 m 00
7 m  00

co = area in square meters
4m200
4m2 00
3 m2 00

SL — co =                                  ......
10 00
8 00
18 67

Qo = volume of gases flowing per sec . . . t° = average temperature ...........
12 m3 77 630°
7m3 58 550°
5m3 19 750°

1 ~\~a.t — gas factor      ...................
3.312
3.0185
3 7525

Qf = Qo(l -\-otC) average volume gas
42 m3 29
22 m3 89
19 m3 48

vi = Qt-z-(Jl) = velocity m per sec
10 m  58
5m 72
6 m  50

AO ^ specific weight of flue gases .....
1 kg 32

AI = AO -r- ( 1 -\-ott} — kg per m3 gas ......
0 399
0.437
0 352

7=frictional resistance in kg per m2 = 0 016X10 00X10.58X0.399 =
0 kg 676

0 016X 8 OOX 5 72X0 437 =

0 kg 320

0 016X18 67X 6 50X0 352 =

0 kg 684

The pressure necessary to impress the velocity upon the gases in these flues will be : 5 = A,(?;,2-~20> =ke t>er m2 = ............
2.250
0.730
0.760

```